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SIU SOM Logo. Microtome for cutting ultrathin tissue sections. Panulirus interruptus , the California spiny lobster. Stomatogastric ganglion. Synaptic contacts within a small region of nervous tissue. Shape of one nerve cell (in lobster stomatogastric ganglion).

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slide5

Panulirusinterruptus,

the California spiny lobster

Stomatogastric ganglion

slide8

Shape of one nerve cell

(in lobster stomatogastric ganglion)

slide15

Thorax

Abdomen

Head

the cardia in the fly digestive tract

slide27

“Giant” nerve fibers ( * )

in cross section of fly nerve cord

slide29

Drosophila melanogaster

Muscina

pascuorum

Minettia

magna

slide30

Tipulidae, TipulabicornisForbesLauxaniidae, Minettia magna (Coquillett)

Tabanidae, TabanuscalensLinnaeusSyrphidae, HelophilusfasciatusWalker

Fly species differ in their distributions of nerve-fiber diameter.

Bombyliidae, Sparnopoliussp.Bombyliidae, Poecilanthraxsp.

slide32

One point which has greatly troubled me; . . . what the devil determines each particular variation? What makes a tuft of feathers come on a cocks head, or moss on a moss rose?

Charles Darwin

Letter to T.H. Huxley 1859